炔丙醚与有机铜试剂反应,通过对三键进行顺式加成,然后β-消除生成的烯基铜物质来提供丙二烯。使用手性炔丙醚和化学计量有机铜试剂,表明 β-消除步骤是纯反的,导致形成具有 96% 光学产率的手性丙二烯。使用格氏试剂 RMgX 和催化量的 Cu I 盐进行相同的反应,通过反或顺整个过程提供丙二烯。关键的步骤是β-消除中间体烯基有机金属物种,它是反型与 RMgI 和顺型与 RMgCl。丙炔乙酸酯,在该反应中也提供丙二烯,但通过 Cu III 中间体,对这种“卤素效应”不敏感
Reactions of 3-alkyl- and 3,3-dialkyl-1-bromoallenes with organocuprates: Effects of the nature of the cuprate reagent on the regio- and stereoselectivity
作者:Anna Maria Caporusso、Carmela Polizzi、Luciano Lardicci
DOI:10.1016/s0040-4039(00)96867-9
日期:1987.1
Organocuprates induce 1,3- and direct substitution in 3-alkyl- and 3,3-dialkyl-1-bromo-1,2-dienes leading respectively to either terminal acetylenes or allenic hydrocarbons. The nature of the cuprate exerts a prominent role in determining both the regio- and the stereochemistry of these reactions.
Reaction of 1-bromo-1,2-dienes with alkylcuprates as a regio- and stereo-selective route to acetylenic or allenic compounds
作者:Carmela Polizzi、Carla Consoloni、Luciano Lardicci、Anna Maria Caporusso
DOI:10.1016/0022-328x(91)80179-n
日期:1991.10
Alkylcuprates react with 1-bromo-1,2-dienes to give allenic and/or acetylenic products. The selectivity of the crosscoupling is markedly dependent on the nature of the copper reagent, which plays a prominent role in determining both the regio- and the stereo-chemistry. The preparative aspects of these copper-induced reactions are discussed and their possible mechanism discussed.
Petrow et al., Optika i Spektroskopiya, 1959, vol. 7, p. 267,268;engl.Ausg.S.170
作者:Petrow et al.
DOI:——
日期:——
ALEXAKIS, A.;MAREK, I.;MANGENEY, P.;NORMANT, J. F., J. AMER. CHEM. SOC., 112,(1990) N2, C. 8042-8047
作者:ALEXAKIS, A.、MAREK, I.、MANGENEY, P.、NORMANT, J. F.
DOI:——
日期:——
Mechanistic aspects of the formation of chiral allenes from propargylic ethers and organocopper reagents
作者:A. Alexakis、I. Marek、P. Mangeney、J. F. Normant
DOI:10.1021/ja00178a029
日期:1990.10
Propargylic ethers react with organocopperreagents to afford allenes by a syn addition to the triple bond followed by a β-elimination of the resulting alkenyl copper species. With use of chiral propargylic ethers and stoichiometric organocopperreagent, it was shown that the β-elimination step is purely anti, resulting in the formation of a chiral allene with 96% optical yield. The same reaction,
炔丙醚与有机铜试剂反应,通过对三键进行顺式加成,然后β-消除生成的烯基铜物质来提供丙二烯。使用手性炔丙醚和化学计量有机铜试剂,表明 β-消除步骤是纯反的,导致形成具有 96% 光学产率的手性丙二烯。使用格氏试剂 RMgX 和催化量的 Cu I 盐进行相同的反应,通过反或顺整个过程提供丙二烯。关键的步骤是β-消除中间体烯基有机金属物种,它是反型与 RMgI 和顺型与 RMgCl。丙炔乙酸酯,在该反应中也提供丙二烯,但通过 Cu III 中间体,对这种“卤素效应”不敏感